The researchers then put mice injected with ghrelin and control mice through a maze and other intelligence tests. In each case, the biochemically âhungryâ mice â mice infused with ghrelin â performed notably better than those with normal levels of the hormone. The finding was startling, but âit makes sense,â Horvath says. âWhen you are hungry, you need to focus your entire system on finding food in the environment.â In fact, some biologists believe that human intelligence itself evolved because it made early hominids more effective hunters, gathers and foragers.
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